Abstract
Hereditary cone diseases manifest as progressive or stationary disorders. Among the stationary cone disorders autosomal recessive achromatopsia occurs most frequently and begins within the first months of life with nystagmus and photophobia. Color discrimination is not possible, and visual acuity is severely reduced. In addition to a thorough ophthalmic examination, color vision tests and electrophysiology are prerequisites to establish a diagnosis of achromatopsia. A genetic examination is very helpful to distinguish achromatopsia from other stationary cone disorders like X-linked recessive blue cone monochromatism and from progressive cone and cone-rod dystrophies. It is the correct clinical and genetic diagnosis that eventually will allow an individual prognosis, accurate genetic counseling, and the optimal choice of low vision aids.
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